In-Display Fingerprint Detection Threshold Control
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Solution Overview
Problem
In-display fingerprint identification systems face challenges in acquiring clear fingerprint images due to users' habit of short touch durations, leading to poor user experience and increased energy consumption from frequent screen illumination.
Innovation Solution
A method that detects touch operations on a fingerprint region, compares touch signals with preset thresholds, analyzes fingerprint image quality, and adjusts screen brightness and prompts to ensure sufficient image acquisition time and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the screen is illuminated frequently to capture fingerprint images, then the fingerprint identification accuracy is improved, but the energy consumption increases
Solution Approach 1:
The system performs preliminary detection of touch pressure and touch area before initiating screen illumination and fingerprint image capture. By pre-assessing whether the touch meets minimum thresholds for valid fingerprint acquisition, the system avoids unnecessary screen activations and energy consumption while ensuring that only promising touches proceed to full image capture
Solution Approach 2:
The system continuously monitors touch pressure and touch area during the interaction, providing real-time feedback to determine whether to proceed with screen illumination and fingerprint capture. This feedback mechanism allows dynamic adjustment based on actual touch conditions, optimizing the balance between image quality and energy usage
2Ease of operation
If the touch duration is shortened for user convenience, then the ease of operation is improved, but the fingerprint image acquisition quality deteriorates
Solution Approach 1:
The system performs preliminary assessment of touch pressure and touch area immediately upon touch detection, before requiring the user to maintain the touch. This preliminary evaluation determines whether the touch is likely to produce a valid fingerprint image, allowing the system to either proceed quickly with capture (improving ease of operation) or request extended touch duration (maintaining image quality) based on the initial assessment
Solution Approach 2:
The system dynamically adjusts the required touch duration and capture timing based on real-time monitoring of touch pressure and touch area characteristics. For strong, well-positioned touches, the system can capture images quickly; for weaker or less precise touches, it can extend the acquisition window, creating a dynamic adaptation that balances user convenience with image quality
3Ease of operation
If the touch pressure threshold is lowered to accommodate light touches, then the ease of operation is improved, but false touch operations increase
Solution Approach 1:
The system segments the touch detection process into multiple independent evaluation stages: initial touch detection, pressure threshold evaluation, touch area verification, and final capture decision. By dividing the detection into separate criteria that must all be satisfied, the system can maintain low pressure thresholds for accessibility while using additional checks (touch area size, touch stability) to filter out false positives
Solution Approach 2:
The system performs multiple partial checks (pressure threshold, touch area minimum size, touch stability duration) before committing to full fingerprint capture. These partial actions serve as progressive filters that gradually eliminate false touches while maintaining accessibility, requiring only that each individual threshold be met rather than demanding perfect touch conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves the accuracy and efficiency of fingerprint image acquisition, enhances user experience by reducing false touch operations, and optimizes energy consumption by minimizing unnecessary screen illumination.
Implementation Method 1
optical signals are provided based on the self-luminescence of an organic light-emitting diode (OLED)
Data Source
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AI summary
The disclosure relates to a method, electronic device, and non-transitory computer-readable medium for collecting fingerprints. The method includes: detecting a touch operation on a fingerprint region; when the touch operation on the fingerprint region is detected, detecting a touch signal within the fingerprint region as a first touch signal; comparing the first touch signal with a preset report threshold to obtain a first comparison result; determining whether a fingerprint image on the fingerprint region is acquired based on the first comparison result; when the fingerprint image is acquired, analyzing the fingerprint image to obtain an analysis result; and outputting a prompt based on the analysis result.